(IMAGE) CNRS Caption Flowstone formation in the Sala de las Estrellas at Cueva de Ardales (Malaga, Andalusia), with the traces of red pigment analysed and discussed in the article. © João Zilhão, ICREA Credit © João Zilhão, ICREA Usage Restrictions use only to promote the article from a scientific point of view using appropriate credits and description License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.